Plug



FIG. 1 is a perspective view of the front, top and left side of a plug showing my new design;

FIG. 2 is a perspective view of the rear, bottom and right side thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view of thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a plug, as shown and described. 